Messaging Server Installation, Upgrade, and Uninstallation

This section describes known issues with installing, upgrading, and
uninstalling Messaging Server.

4991650

This version of Messaging Server does
not support a staged rolling upgrade with minimum downtime in a symmetric
HA environment.

With Messaging Server 5.2, you could install the Messaging Server more
than once on the same machine and patch the different installations separately.
This capability enabled support for minimal-downtime staged rolling upgrades.

6175770

You must use the Communications Services
installer to install a cluster agent for Messaging Server.